590 lines
22 KiB
Nim
590 lines
22 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2022 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import
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std/tables,
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stew/results,
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chronicles, chronos, metrics, taskpools,
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../spec/[helpers, forks],
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../spec/datatypes/[altair, phase0],
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../consensus_object_pools/[
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block_clearance, block_quarantine, blockchain_dag, exit_pool, attestation_pool,
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light_client_pool, sync_committee_msg_pool],
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../validators/validator_pool,
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../beacon_clock,
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"."/[gossip_validation, block_processor, batch_validation]
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export
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results, taskpools, block_clearance, blockchain_dag, exit_pool, attestation_pool,
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light_client_pool, sync_committee_msg_pool, validator_pool, beacon_clock,
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gossip_validation, block_processor, batch_validation, block_quarantine
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logScope: topics = "gossip_eth2"
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# Metrics for tracking attestation and beacon block loss
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declareCounter beacon_attestations_received,
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"Number of valid unaggregated attestations processed by this node"
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declareCounter beacon_attestations_dropped,
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"Number of invalid unaggregated attestations dropped by this node", labels = ["reason"]
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declareCounter beacon_aggregates_received,
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"Number of valid aggregated attestations processed by this node"
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declareCounter beacon_aggregates_dropped,
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"Number of invalid aggregated attestations dropped by this node", labels = ["reason"]
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declareCounter beacon_blocks_received,
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"Number of valid blocks processed by this node"
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declareCounter beacon_blocks_dropped,
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"Number of invalid blocks dropped by this node", labels = ["reason"]
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declareCounter beacon_attester_slashings_received,
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"Number of valid attester slashings processed by this node"
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declareCounter beacon_attester_slashings_dropped,
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"Number of invalid attester slashings dropped by this node", labels = ["reason"]
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declareCounter beacon_proposer_slashings_received,
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"Number of valid proposer slashings processed by this node"
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declareCounter beacon_proposer_slashings_dropped,
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"Number of invalid proposer slashings dropped by this node", labels = ["reason"]
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declareCounter beacon_voluntary_exits_received,
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"Number of valid voluntary exits processed by this node"
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declareCounter beacon_voluntary_exits_dropped,
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"Number of invalid voluntary exits dropped by this node", labels = ["reason"]
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declareCounter beacon_sync_committee_messages_received,
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"Number of valid sync committee messages processed by this node"
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declareCounter beacon_sync_committee_messages_dropped,
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"Number of invalid sync committee messages dropped by this node", labels = ["reason"]
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declareCounter beacon_sync_committee_contributions_received,
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"Number of valid sync committee contributions processed by this node"
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declareCounter beacon_sync_committee_contributions_dropped,
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"Number of invalid sync committee contributions dropped by this node", labels = ["reason"]
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const delayBuckets = [2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, Inf]
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declareHistogram beacon_attestation_delay,
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"Time(s) between slot start and attestation reception", buckets = delayBuckets
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declareHistogram beacon_aggregate_delay,
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"Time(s) between slot start and aggregate reception", buckets = delayBuckets
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declareHistogram beacon_block_delay,
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"Time(s) between slot start and beacon block reception", buckets = delayBuckets
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type
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DoppelgangerProtection = object
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broadcastStartEpoch*: Epoch ##\
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## Set anew, each time gossip is re-enabled after syncing completes, so
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## might reset multiple times per instance. This allows some safe level
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## of gossip interleaving between nodes so long as they don't gossip at
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## the same time.
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nodeLaunchSlot*: Slot ##\
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## Set once, at node launch. This functions as a basic protection against
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## false positives from attestations persisting within the gossip network
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## across quick restarts.
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Eth2Processor* = object
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## The Eth2Processor is the entry point for untrusted message processing -
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## when we receive messages from various sources, we pass them to the
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## processor for validation and routing - the messages are generally
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## validated, and if valid, passed on to the various pools, monitors and
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## managers to update the state of the application.
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##
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## Block processing is special in that part of it is done in the
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## `BlockProcessor` instead, via a special block processing queue.
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##
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## Each validating function generally will do a sanity check on the message
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## whose purpose is to quickly filter out spam, then will (usually) delegate
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## full validation to the proper manager - finally, metrics and monitoring
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## are updated.
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doppelgangerDetectionEnabled*: bool
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# Local sources of truth for validation
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# ----------------------------------------------------------------
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dag*: ChainDAGRef
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attestationPool*: ref AttestationPool
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validatorPool: ref ValidatorPool
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syncCommitteeMsgPool: ref SyncCommitteeMsgPool
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lightClientPool: ref LightClientPool
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doppelgangerDetection*: DoppelgangerProtection
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# Gossip validated -> enqueue for further verification
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# ----------------------------------------------------------------
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blockProcessor*: ref BlockProcessor
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# Validator monitoring
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validatorMonitor: ref ValidatorMonitor
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# Validated with no further verification required
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# ----------------------------------------------------------------
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exitPool: ref ExitPool
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# Almost validated, pending cryptographic signature check
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# ----------------------------------------------------------------
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batchCrypto*: ref BatchCrypto
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# Missing information
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# ----------------------------------------------------------------
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quarantine*: ref Quarantine
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# Application-provided current time provider (to facilitate testing)
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getCurrentBeaconTime*: GetBeaconTimeFn
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ValidationRes* = Result[void, ValidationError]
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func toValidationResult*(res: ValidationRes): ValidationResult =
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if res.isOk(): ValidationResult.Accept else: res.error()[0]
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# Initialization
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# ------------------------------------------------------------------------------
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proc new*(T: type Eth2Processor,
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doppelgangerDetectionEnabled: bool,
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blockProcessor: ref BlockProcessor,
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validatorMonitor: ref ValidatorMonitor,
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dag: ChainDAGRef,
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attestationPool: ref AttestationPool,
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exitPool: ref ExitPool,
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validatorPool: ref ValidatorPool,
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syncCommitteeMsgPool: ref SyncCommitteeMsgPool,
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lightClientPool: ref LightClientPool,
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quarantine: ref Quarantine,
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rng: ref HmacDrbgContext,
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getBeaconTime: GetBeaconTimeFn,
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taskpool: TaskPoolPtr
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): ref Eth2Processor =
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(ref Eth2Processor)(
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doppelgangerDetectionEnabled: doppelgangerDetectionEnabled,
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doppelgangerDetection: DoppelgangerProtection(
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nodeLaunchSlot: getBeaconTime().slotOrZero,
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broadcastStartEpoch: FAR_FUTURE_EPOCH),
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blockProcessor: blockProcessor,
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validatorMonitor: validatorMonitor,
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dag: dag,
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attestationPool: attestationPool,
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exitPool: exitPool,
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validatorPool: validatorPool,
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syncCommitteeMsgPool: syncCommitteeMsgPool,
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lightClientPool: lightClientPool,
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quarantine: quarantine,
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getCurrentBeaconTime: getBeaconTime,
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batchCrypto: BatchCrypto.new(
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rng = rng,
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# Only run eager attestation signature verification if we're not
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# processing blocks in order to give priority to block processing
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eager = proc(): bool = not blockProcessor[].hasBlocks(),
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taskpool)
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)
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# Each validator logs, validates then passes valid data to its destination
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# further down the line - in particular, validation should generally not have
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# any side effects until the message is fully validated, or invalid messages
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# could be used to push out valid messages.
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proc processSignedBeaconBlock*(
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self: var Eth2Processor, src: MsgSource,
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signedBlock: ForkySignedBeaconBlock): ValidationRes =
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let
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wallTime = self.getCurrentBeaconTime()
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(afterGenesis, wallSlot) = wallTime.toSlot()
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logScope:
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blockRoot = shortLog(signedBlock.root)
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blck = shortLog(signedBlock.message)
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signature = shortLog(signedBlock.signature)
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wallSlot
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if not afterGenesis:
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notice "Block before genesis"
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return errIgnore("Block before genesis")
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# Potential under/overflows are fine; would just create odd metrics and logs
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let delay = wallTime - signedBlock.message.slot.start_beacon_time
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# Start of block processing - in reality, we have already gone through SSZ
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# decoding at this stage, which may be significant
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debug "Block received", delay
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let v =
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self.dag.validateBeaconBlock(self.quarantine, signedBlock, wallTime, {})
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if v.isOk():
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# Block passed validation - enqueue it for processing. The block processing
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# queue is effectively unbounded as we use a freestanding task to enqueue
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# the block - this is done so that when blocks arrive concurrently with
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# sync, we don't lose the gossip blocks, but also don't block the gossip
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# propagation of seemingly good blocks
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trace "Block validated"
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self.blockProcessor[].addBlock(
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src, ForkedSignedBeaconBlock.init(signedBlock),
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validationDur = nanoseconds(
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(self.getCurrentBeaconTime() - wallTime).nanoseconds))
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# Validator monitor registration for blocks is done by the processor
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beacon_blocks_received.inc()
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beacon_block_delay.observe(delay.toFloatSeconds())
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else:
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debug "Dropping block", error = v.error()
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self.blockProcessor[].dumpInvalidBlock(signedBlock)
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beacon_blocks_dropped.inc(1, [$v.error[0]])
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v
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proc setupDoppelgangerDetection*(self: var Eth2Processor, slot: Slot) =
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# When another client's already running, this is very likely to detect
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# potential duplicate validators, which can trigger slashing.
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#
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# Every missed attestation costs approximately 3*get_base_reward(), which
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# can be up to around 10,000 Wei. Thus, skipping attestations isn't cheap
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# and one should gauge the likelihood of this simultaneous launch to tune
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# the epoch delay to one's perceived risk.
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const duplicateValidatorEpochs = 2
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# TODO:
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# We should switch to a model where this value is set for each validator
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# as it gets added to the validator pool.
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# Currently, we set it here because otherwise if the client is started
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# without any validators, it will remain set to FAR_FUTURE_EPOCH and
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# any new validators added through the Keymanager API will never get
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# activated.
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self.doppelgangerDetection.broadcastStartEpoch =
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slot.epoch + duplicateValidatorEpochs
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if self.validatorPool[].count() > 0:
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if self.doppelgangerDetectionEnabled:
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notice "Setting up doppelganger detection",
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epoch = slot.epoch,
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broadcastStartEpoch = self.doppelgangerDetection.broadcastStartEpoch
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proc checkForPotentialDoppelganger(
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self: var Eth2Processor, attestation: Attestation,
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attesterIndices: openArray[ValidatorIndex]) =
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# Only check for attestations after node launch. There might be one slot of
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# overlap in quick intra-slot restarts so trade off a few true negatives in
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# the service of avoiding more likely false positives.
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if not self.doppelgangerDetectionEnabled:
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return
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if attestation.data.slot <= self.doppelgangerDetection.nodeLaunchSlot + 1:
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return
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if attestation.data.slot.epoch <
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self.doppelgangerDetection.broadcastStartEpoch and
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self.doppelgangerDetection.nodeLaunchSlot > GENESIS_SLOT:
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for validatorIndex in attesterIndices:
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let validatorPubkey = self.dag.validatorKey(validatorIndex).get().toPubKey()
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if not isNil(self.validatorPool[].getValidator(validatorPubkey)):
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warn "We believe you are currently running another instance of the same validator. We've disconnected you from the network as this presents a significant slashing risk. Possible next steps are (a) making sure you've disconnected your validator from your old machine before restarting the client; and (b) running the client again with the gossip-slashing-protection option disabled, only if you are absolutely sure this is the only instance of your validator running, and reporting the issue at https://github.com/status-im/nimbus-eth2/issues.",
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validatorIndex,
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validatorPubkey,
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attestation = shortLog(attestation)
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# Avoid colliding with
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# https://www.freedesktop.org/software/systemd/man/systemd.exec.html#Process%20Exit%20Codes
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const QuitDoppelganger = 129
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quit QuitDoppelganger
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proc processAttestation*(
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self: ref Eth2Processor, src: MsgSource,
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attestation: Attestation, subnet_id: SubnetId,
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checkSignature: bool = true): Future[ValidationRes] {.async.} =
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var wallTime = self.getCurrentBeaconTime()
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let (afterGenesis, wallSlot) = wallTime.toSlot()
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logScope:
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attestation = shortLog(attestation)
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subnet_id
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wallSlot
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if not afterGenesis:
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notice "Attestation before genesis"
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return errIgnore("Attestation before genesis")
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# Potential under/overflows are fine; would just create odd metrics and logs
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let delay = wallTime - attestation.data.slot.start_beacon_time
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debug "Attestation received", delay
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# Now proceed to validation
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let v =
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await self.attestationPool.validateAttestation(
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self.batchCrypto, attestation, wallTime, subnet_id, checkSignature)
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return if v.isOk():
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# Due to async validation the wallTime here might have changed
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wallTime = self.getCurrentBeaconTime()
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let (attester_index, sig) = v.get()
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self[].checkForPotentialDoppelganger(attestation, [attester_index])
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trace "Attestation validated"
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self.attestationPool[].addAttestation(
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attestation, [attester_index], sig, wallTime)
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self.validatorMonitor[].registerAttestation(
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src, wallTime, attestation, attester_index)
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beacon_attestations_received.inc()
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beacon_attestation_delay.observe(delay.toFloatSeconds())
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ok()
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else:
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debug "Dropping attestation", validationError = v.error
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beacon_attestations_dropped.inc(1, [$v.error[0]])
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err(v.error())
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proc processSignedAggregateAndProof*(
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self: ref Eth2Processor, src: MsgSource,
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signedAggregateAndProof: SignedAggregateAndProof,
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checkSignature = true, checkCover = true): Future[ValidationRes] {.async.} =
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var wallTime = self.getCurrentBeaconTime()
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let (afterGenesis, wallSlot) = wallTime.toSlot()
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logScope:
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aggregate = shortLog(signedAggregateAndProof.message.aggregate)
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aggregator_index = signedAggregateAndProof.message.aggregator_index
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selection_proof = shortLog(signedAggregateAndProof.message.selection_proof)
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signature = shortLog(signedAggregateAndProof.signature)
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wallSlot
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if not afterGenesis:
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notice "Aggregate before genesis"
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return errIgnore("Aggregate before genesis")
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# Potential under/overflows are fine; would just create odd logs
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let delay =
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wallTime - signedAggregateAndProof.message.aggregate.data.slot.start_beacon_time
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debug "Aggregate received", delay
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let v =
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await self.attestationPool.validateAggregate(
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self.batchCrypto, signedAggregateAndProof, wallTime,
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checkSignature = checkSignature, checkCover = checkCover)
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return if v.isOk():
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# Due to async validation the wallTime here might have changed
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wallTime = self.getCurrentBeaconTime()
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let (attesting_indices, sig) = v.get()
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self[].checkForPotentialDoppelganger(
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signedAggregateAndProof.message.aggregate, attesting_indices)
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trace "Aggregate validated"
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self.attestationPool[].addAttestation(
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signedAggregateAndProof.message.aggregate, attesting_indices, sig,
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wallTime)
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self.validatorMonitor[].registerAggregate(
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src, wallTime, signedAggregateAndProof.message, attesting_indices)
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beacon_aggregates_received.inc()
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beacon_aggregate_delay.observe(delay.toFloatSeconds())
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ok()
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else:
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debug "Dropping aggregate", error = v.error
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beacon_aggregates_dropped.inc(1, [$v.error[0]])
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err(v.error())
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proc processAttesterSlashing*(
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self: var Eth2Processor, src: MsgSource,
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attesterSlashing: AttesterSlashing): ValidationRes =
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logScope:
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attesterSlashing = shortLog(attesterSlashing)
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debug "Attester slashing received"
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let v = self.exitPool[].validateAttesterSlashing(attesterSlashing)
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if v.isOk():
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trace "Attester slashing validated"
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self.exitPool[].addMessage(attesterSlashing)
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self.validatorMonitor[].registerAttesterSlashing(src, attesterSlashing)
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beacon_attester_slashings_received.inc()
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else:
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debug "Dropping attester slashing", validationError = v.error
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beacon_attester_slashings_dropped.inc(1, [$v.error[0]])
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v
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proc processProposerSlashing*(
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self: var Eth2Processor, src: MsgSource,
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proposerSlashing: ProposerSlashing): Result[void, ValidationError] =
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logScope:
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proposerSlashing = shortLog(proposerSlashing)
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debug "Proposer slashing received"
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let v = self.exitPool[].validateProposerSlashing(proposerSlashing)
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if v.isOk():
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trace "Proposer slashing validated"
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self.exitPool[].addMessage(proposerSlashing)
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self.validatorMonitor[].registerProposerSlashing(src, proposerSlashing)
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beacon_proposer_slashings_received.inc()
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else:
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debug "Dropping proposer slashing", validationError = v.error
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beacon_proposer_slashings_dropped.inc(1, [$v.error[0]])
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v
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proc processSignedVoluntaryExit*(
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self: var Eth2Processor, src: MsgSource,
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signedVoluntaryExit: SignedVoluntaryExit): Result[void, ValidationError] =
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logScope:
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signedVoluntaryExit = shortLog(signedVoluntaryExit)
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debug "Voluntary exit received"
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let v = self.exitPool[].validateVoluntaryExit(signedVoluntaryExit)
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if v.isOk():
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trace "Voluntary exit validated"
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self.exitPool[].addMessage(signedVoluntaryExit)
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self.validatorMonitor[].registerVoluntaryExit(
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src, signedVoluntaryExit.message)
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beacon_voluntary_exits_received.inc()
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else:
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debug "Dropping voluntary exit", error = v.error
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beacon_voluntary_exits_dropped.inc(1, [$v.error[0]])
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v
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proc processSyncCommitteeMessage*(
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self: ref Eth2Processor, src: MsgSource,
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syncCommitteeMsg: SyncCommitteeMessage,
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subcommitteeIdx: SyncSubcommitteeIndex,
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checkSignature: bool = true): Future[Result[void, ValidationError]] {.async.} =
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let
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wallTime = self.getCurrentBeaconTime()
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wallSlot = wallTime.slotOrZero()
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logScope:
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syncCommitteeMsg = shortLog(syncCommitteeMsg)
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subcommitteeIdx
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wallSlot
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# Potential under/overflows are fine; would just create odd metrics and logs
|
|
let delay = wallTime - syncCommitteeMsg.slot.start_beacon_time
|
|
debug "Sync committee message received", delay
|
|
|
|
# Now proceed to validation
|
|
let v = await validateSyncCommitteeMessage(
|
|
self.dag, self.batchCrypto, self.syncCommitteeMsgPool,
|
|
syncCommitteeMsg, subcommitteeIdx, wallTime, checkSignature)
|
|
return if v.isOk():
|
|
trace "Sync committee message validated"
|
|
let (positions, cookedSig) = v.get()
|
|
|
|
self.syncCommitteeMsgPool[].addSyncCommitteeMessage(
|
|
syncCommitteeMsg.slot,
|
|
syncCommitteeMsg.beacon_block_root,
|
|
syncCommitteeMsg.validator_index,
|
|
cookedSig,
|
|
subcommitteeIdx,
|
|
positions)
|
|
|
|
self.validatorMonitor[].registerSyncCommitteeMessage(
|
|
src, wallTime, syncCommitteeMsg)
|
|
|
|
beacon_sync_committee_messages_received.inc()
|
|
|
|
ok()
|
|
else:
|
|
debug "Dropping sync committee message", error = v.error
|
|
beacon_sync_committee_messages_dropped.inc(1, [$v.error[0]])
|
|
err(v.error())
|
|
|
|
proc processSignedContributionAndProof*(
|
|
self: ref Eth2Processor, src: MsgSource,
|
|
contributionAndProof: SignedContributionAndProof,
|
|
checkSignature: bool = true): Future[Result[void, ValidationError]] {.async.} =
|
|
let
|
|
wallTime = self.getCurrentBeaconTime()
|
|
wallSlot = wallTime.slotOrZero()
|
|
|
|
logScope:
|
|
contribution = shortLog(contributionAndProof.message.contribution)
|
|
signature = shortLog(contributionAndProof.signature)
|
|
aggregator_index = contributionAndProof.message.aggregator_index
|
|
selection_proof = contributionAndProof.message.selection_proof
|
|
wallSlot
|
|
|
|
# Potential under/overflows are fine; would just create odd metrics and logs
|
|
let delay = wallTime - contributionAndProof.message.contribution.slot.start_beacon_time
|
|
debug "Contribution received", delay
|
|
|
|
# Now proceed to validation
|
|
let v = await validateContribution(
|
|
self.dag, self.batchCrypto, self.syncCommitteeMsgPool,
|
|
contributionAndProof, wallTime, checkSignature)
|
|
|
|
return if v.isOk():
|
|
trace "Contribution validated"
|
|
let addStatus = self.syncCommitteeMsgPool[].addContribution(
|
|
contributionAndProof, v.get()[0])
|
|
|
|
self.validatorMonitor[].registerSyncContribution(
|
|
src, wallTime, contributionAndProof.message, v.get()[1])
|
|
|
|
beacon_sync_committee_contributions_received.inc()
|
|
|
|
case addStatus
|
|
of newBest, notBestButNotSubsetOfBest: ok()
|
|
of strictSubsetOfTheBest:
|
|
# This implements the spec directive:
|
|
#
|
|
# _[IGNORE]_ A valid sync committee contribution with equal `slot`, `beacon_block_root`
|
|
# and `subcommittee_index` whose `aggregation_bits` is non-strict superset has _not_
|
|
# already been seen.
|
|
#
|
|
# We are implementing this here, because this may be an unique contribution, so we would
|
|
# like for it to be counted and registered by the validator monitor above.
|
|
errIgnore("strict superset already seen")
|
|
else:
|
|
debug "Dropping contribution", error = v.error
|
|
beacon_sync_committee_contributions_dropped.inc(1, [$v.error[0]])
|
|
|
|
err(v.error())
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#process_light_client_finality_update
|
|
proc processLightClientFinalityUpdate*(
|
|
self: var Eth2Processor, src: MsgSource,
|
|
finality_update: altair.LightClientFinalityUpdate
|
|
): Result[void, ValidationError] =
|
|
let
|
|
wallTime = self.getCurrentBeaconTime()
|
|
v = validateLightClientFinalityUpdate(
|
|
self.lightClientPool[], self.dag, finality_update, wallTime)
|
|
v
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/sync-protocol.md#process_light_client_optimistic_update
|
|
proc processLightClientOptimisticUpdate*(
|
|
self: var Eth2Processor, src: MsgSource,
|
|
optimistic_update: altair.LightClientOptimisticUpdate
|
|
): Result[void, ValidationError] =
|
|
let
|
|
wallTime = self.getCurrentBeaconTime()
|
|
v = validateLightClientOptimisticUpdate(
|
|
self.lightClientPool[], self.dag, optimistic_update, wallTime)
|
|
v
|